migration: Move error reporting out of migration_cleanup

In the next patches migration_cleanup() will be used in qmp_migrate(),
which currently does not show an error message. Move the error
reporting out of migration_cleanup() to avoid duplicate messages.

Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Prasad Pandit <pjp@fedoraproject.org>
Link: https://lore.kernel.org/qemu-devel/20260123141656.6765-9-farosas@suse.de
Signed-off-by: Fabiano Rosas <farosas@suse.de>

migration/migration.c

@@ -1527,10 +1527,6 @@ static void migration_cleanup(MigrationState *s)
                           MIGRATION_STATUS_CANCELLED);
     }
 
-    if (s->error) {
-        /* It is used on info migrate.  We can't free it */
-        error_report_err(error_copy(s->error));
-    }
     type = migration_has_failed(s) ? MIG_EVENT_PRECOPY_FAILED :
                                      MIG_EVENT_PRECOPY_DONE;
     migration_call_notifiers(type, NULL);
@@ -1539,7 +1535,12 @@ static void migration_cleanup(MigrationState *s)
 
 static void migration_cleanup_bh(void *opaque)
 {
-    migration_cleanup(opaque);
+    MigrationState *s = opaque;
+
+    migration_cleanup(s);
+    if (s->error) {
+        error_report_err(error_copy(s->error));
+    }
 }
 
 /*
@@ -4017,18 +4018,12 @@ void migration_connect(MigrationState *s, Error *error_in)
     s->expected_downtime = migrate_downtime_limit();
     if (error_in) {
         migration_connect_error_propagate(s, error_in);
-        if (resume) {
-            /*
-             * Don't do cleanup for resume if channel is invalid, but only dump
-             * the error.  We wait for another channel connect from the user.
-             * The error_report still gives HMP user a hint on what failed.
-             * It's normally done in migration_cleanup(), but call it here
-             * explicitly.
-             */
-            error_report_err(error_copy(s->error));
-        } else {
+        if (!resume) {
             migration_cleanup(s);
         }
+        if (s->error) {
+            error_report_err(error_copy(s->error));
+        }
         return;
     }
 
@@ -4107,8 +4102,10 @@ fail:
     if (s->state != MIGRATION_STATUS_CANCELLING) {
         migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED);
     }
-    error_report_err(local_err);
     migration_cleanup(s);
+    if (s->error) {
+        error_report_err(error_copy(s->error));
+    }
 }
 
 static void migration_class_init(ObjectClass *klass, const void *data)